30-seconds-of-code/snippets/js/s/collect-into.md

title, type, language, tags, cover, dateModified

title	type	language	tags	cover	dateModified
Convert function to variadic	snippet	javascript	function array	polar-bear	2021-06-13T13:50:25+03:00

Changes a function that accepts an array into a variadic function.

• Given a function, return a closure that collects all inputs into an array-accepting function.

const collectInto = fn => (...args) => fn(args);

const Pall = collectInto(Promise.all.bind(Promise));
let p1 = Promise.resolve(1);
let p2 = Promise.resolve(2);
let p3 = new Promise(resolve => setTimeout(resolve, 2000, 3));
Pall(p1, p2, p3).then(console.log); // [1, 2, 3] (after about 2 seconds)